但是米国这里好像一律都说成病毒性的，
That is not right.
两者的symptom 有什么区别？
It is not accurate to make the distinction based on symptoms.
Upper respiratory tract infection is rarely caused by bacteria in a healthy
person.
The reality is that the bacteria is there normally all the time, and an
healthy person has very effective way defending it except for several
special locations and special bacterial species. These conditions are
usually ruled out by your doctor during the visit based on your history and
physical
